Is the electron-nucleus interaction attractive or repulsive? Explain. 10. Is the electron-electron interaction attractive or repulsive? Explain. 11. Based on your interpretation of Figures 2 and 3, do you agree or disagree with the following statements? Explain your reasons for agreeing or disagreeing. a. Electrons in the same shell do not shield each other from the nuclear charge very eff ectively. So, in the case of helium, their attraction to the nucleus is characteristic of a nuclear charge less than, but close to, +2. b. Electrons in inner shells are very good at shielding outer electrons from the nuclear charge. So, in the case of lithium, electron-electron repulsion reduces the eff ective nuclear charge to a value much less than +3.